问题
填空题
制冷系统焊接管路中残存有制冷剂R22时,若温度高达()以上且与明火接触,会在高温作用下分解出对人体有毒的气体。
答案
参考答案:200℃
制冷系统焊接管路中残存有制冷剂R22时,若温度高达()以上且与明火接触,会在高温作用下分解出对人体有毒的气体。
参考答案:200℃
Harry’s father bought a magazine which gave its readers information about all kinds of products and helped them make the best choice while buying. Harry borrowed his father’s magazine when he needed a new computer.“I’ll read it and choose the best one.” He said. The magazine described these computers.
小题1:Harry wants to buy a computer,so he borrowed ________ from his father.
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